I've been told by my doctor that my ds has an ear infection, we thought he had a stomach bug because he has been bringing back up food since Monday morning. Started anti biotic yesterday and he is ok on and off but still bringing up food. We were told to give him food if he's hungry (bottles and dry toast) but he is still bringing it back up again. He keeps down water though. He is really off this morning. Has anyone been here before? Any ideas as to how long it will take the antibiotic to start working?